Improvement in hulling-machines



E; RVER. O'offe'e'Cle aner N-d. 1i05,"643 PatentedJu ly 26, 1870.

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N. PETERS. PHOTO LITHOGRA WASHINGTON D C 1Tb ,atl whom it may concern! Bridgewater, in the county of Plymouth and State of Massachusetts, have invented a new: and improved stationary concave are employed.

a for the purpose specified,-\vhieh will not-become "choked or clogged while in operation, not injure the ante, for which many machines have been devised,

a 'In some of these machines the abrading, surfaces betweeu thern just sufiieient toadmit of thedecortiorotherwise, in order to. operate. on beans of unequal "size. 1

been various. Disks have been used, one or both of which would revolve, andcylinders revolving in a conalso been used for the purpose of hulling coffee, and

motion, the cofiee being held against the planes or plates, and double planes have been used, one having being made with yielding surfaces.

tremely complicated conditions.

i A, cylinder with a fixed or unyielding. surface, re-' volving in a concave, which is also fixed and concen- I J SEPH ELEAZ on EVER, or BRIDGEWATER,MASSACHUSETTS, ASSIGNOR ro nENnYT, PRATT AND JOHN o. ALDEN, or SAME PLACE.

I i mama: N0.105,643, dam? July 26,1870.

IMPROVEME 11v HULLING-MAOHINES.

The Schedule referred-to in these Letters Patent and making part of the same Be it known that I, J osnPH QELEAZER CARVER, of

Machine for Hulling Coffee andItice; and I do here- This invention relates to that class of machines for hulling-cofi'ee'and rice in {which a rotary oylinderfand The object of the invention 'is to obtain a machine article being. operated .npon, especially the miles, by breaking or grinding up the hulls of the same.

My invention is more especially designed for hulling the most common of which consists of two metallic ahradingsnrfitces, between which thecoffee is passed.

. have been retained equidistant, a space being allowed cated .coliee-beans to passthrough without injury, but in inost of them one orboth'of thesurfaces are made, yielding, having fixed pressure, bymeans of a spring,

The devices forgiving motion a to the surfaces'have cave, which is eencentric with its axis, have "also been employed.

Planes having toothed-or corrugated surfaces have arranged so as to have a progressive or a reciprocating corrugated surfaces by springs or pads, or pressurea motion in'one direction, and the otherQa cross motion or reverse to that of the first, one or both planes It is 'evidentthat the cylinder machines have one advantage over all others mentioned,from the fact that the friction is, nearly all thrown upon the bear-' ings of the cylinderfbut these machines have hitherto been less successful than the others, except under ex- The object of my invention is to improve the cylinder machine, and I can best describe how I effect this object by alluding briefly to the dilfieultiesattending the operation'of the ordinary cylinder machines".

- be injured. r

It is of little consequence whether the body of the ling'each a separate yielding movement, one portion for section will reeede and increase the distance between it and the cylinder, either by the passage of a largezbean or bunch of beans, or a stone, and the tendency of the cofiee is to pack at that point, particnlarly if it is at the lower part of the cylinder, so thatthe coffee, by its own gravity, may fall or roll into the cavity thus created. ,The consequence of this packing is that the beans cease to roll for a moment, and, being held stationary while the cylinder is revolving, are broken or abraded. ,1

Cylinders and cones made of some'yielding substance, like India rubber, have also been used.

My machine consists of a cylinder, rotating in fixed bearings, and a fixed concave, the concave beluga half circle or less, and made in one or more pieces, securedin a positionlconcentric with the cylinder, and at such a distance from it that a singlebean of nnljnlled coffee will be held in place without slippingbetween them, and being thus held it will be seen that when the-cylinder is revolved, the bean will also be revolved,aud at the same time carried around with it, but at a speed less than that of the cylinder. This rotary motion is of great importance, as it prevents the packing of the beans, and' no'portion of the surface of the bean is held in one place long enough to cylinder be smooth or roughened; either surface will operate well.

The cylinder is made with. openings extending'the whole length of its milling-surface; There may be ten of them in a cylinder of fifteen inches in diameter, that is to say, ten rows of openings. These openings are filled by roughened pressure-plates,which have the same curvature as the cylinder, as will be hereinafter more fully-described. The efi'ect is to subject the coffee to a constant rolling motion, under pressure, and not to grind or cut it. The hull soon yields to this treatment, and when sufficiently crushed, the bean'will slip out of it. I

When hulled, some of the beans are carried along upon the s'olid'portion of the cylinder, and some continue to be revolved, but are not-injured.

The number of rows of pressure-plates depends on the diameter of the cylinder, one inch'space being-ah lowed between the-rowsn The number of plates in parts in the two figures.

plates being placed as closely together in the rows as possible and not bind.

. In the accompanying drawing- Figure l is a section of my invention, taken in the line x :c, fig. 2.

Figure 2 is also a section, taken the line 3 y, fig. 1. Similar letters of reference indicate corresponding A represe'ntsa hollow cylinder, fitted on a shaft, B, the latter being allowed to turn freely in its bearings.

The periphery of the cylinder is pierced or cast with a series of holes, a, in which corrugated or toothed plates, 0 G, are fitted. These plates, which are pressure-plates, may be of cast iron or steel, and the cylinder A may be of cast iron.

The plate 0 is attached to a rod, D, which is allowed to slide freely in a bearing, b, and has a spiral spring, 0, upon it, which has a tendency to keep the plate G thrust outward to its fullest extent.

The other pressure-plate G operates substantially in the same way, but the latter ispivoted at one end, as shown at c, and has aspiral spring, (I, bearing against its inner side, as shown clearly in both figures. I prefer, however, the arrangement as shown applied E is a semi-annular concave, which extends about halfway round the cylinder A, and is toothed or corrugated at its inner side.

This concave is concentric with the cylinder, and may be composed of sections bolted to plates 2, one at each side of the cylinder, said concave being fixed or stationary.

11 is an opening for a hopper, which conducts the nnhulled cotlce down between the concave and cyliu der.

It is designed in practice to have a space of about one inch in length between the ends of the pressureplates, and to have the latter but slightly exceed in width the length of a coffee-bean, say about half an inch. By this means the beans are allowed to adjust themselves, and turn freely between the concave and pressure-plates as the cylinder rotates. I

The object in allowing spaces bet-ween the ends of the pressure-plates is to admit of the dropping of the unhulled beans between the ends of the same, a freedom of adjustment being thereby allowed the beans, which greatly favors the stripping of the bulls from the former.

The springs c it give the requisite degree of pressure to the plates 0 G to insure the splitting of the bulls, and the detachment of the same from the beanswith out grinding or breaking up the bulls, the object being to avoid this, so that there will be no dust or powder to contend with, and also to prevent injury to the beans by abrasion. 1

This machine, although it does not seem to dider at first sight, or by a superficial observation, very materially from many other rotary machines of the same class and for the same purpose, still it effects very important resultsnot attained by others, to wit, the beans are subjected toa rotation as the cylinder turns, and this rotation of the beans is independent of the rotation of the cylinder, so far as regards the rying around of the beans with the cylinder, the latter having full power to adjust themselves, and be deprived of their hulls without being crushed or abraded,

as would be the case were there any recesses in the periphery of the cylinder for the beans to lodge and be carried around with it, the beans having two m0- ticns, one with the cylinder, but slower than it, and another motion, which is a rotary one, on their own axes. These two motions insure the desired result, previously alluded to, and said res'ult' isiavored by having an unbroken concave, for that also has no rccesses in which the beans can collect or lodge and be subjected to unnecessary abrasion and crushed.

It is designed in practice to have several longitudinal rows of pressure-plates across the cylinder, the number of rows corresponding of course to its diameter, and the number of plates in each row corre sponding to its length.

I am aware that spring pressure-plates, arranged in the rotating cylinder of machines for shelling corn,

st-rnction from mine, and such I- do not claim; but

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is- The improved hulling-machine herein described, consisting of the hollow rotary cylinder A, provided with the hinged spring pressure-plates O' ,cons tructed as described, and arranged to operate in conjunction with the, fixed semi-annular concave E, substantially in the manner and for the purpose set forth.

JOSEPH ELEAZER CARVER.

\Vitnesses: e

A. R. HAIGHT,

G. M. Aoxnmmn.

have been used, but these have been difi'erent in con- I 

